The giant honeycomb-like setup of 149 spotlights — officially known as “Synlight” — in Juelich, about 30 kilometers (19 miles) west of Cologne, uses xenon short-arc lamps normally found in cinemas to simulate natural sunlight that’s often in short supply in Germany at this time of year.
Pretty cool. I had a hard time this winter with it being so dark. My wife picked up a “happy light” that we switched on mid afternoon to mimic sunlight. It seemed to help, and at least it looked cool.